Date of Award:
5-1970
Document Type:
Dissertation
Degree Name:
Doctor of Philosophy (PhD)
Department:
Civil and Environmental Engineering
Department name when degree awarded
Agricultural and Irrigation Engineering
Committee Chair(s)
Joel E. Fletcher
Committee
Joel E. Fletcher
Committee
A. Alvin Bishop
Committee
R. L. Smith
Committee
W. S. Willis
Abstract
The non-linear partial differential equation (combination of Darcy's law and continuity equation) has been used in this investigation to predict the flooded infiltration through soils possessing appreciable amount of clay and initially drier than its field capacity. One of the most important assumptions made in solving the differential equation is that the capillary conductivity-moisture content relationship is unique for each initial moisture content computation due to the different reaction of clay minerals with different initial moisture contents.
Mathematical equations were also derived to predict:
- The rate of the wetting front advance, prior to the occurrence of surface ponding, taking into account the effect of initial soil moisture content and rate of water application.
- The time at which surface ponding takes place under different rain (sprinkler) intensities by utilizing the intake rate curve obtained under flooded infiltration.
The derived equations enable us to estimate a definite period of time, during which a field can be sprinkled at a given application rate, beyond which if sprinkling continues runoff will take place, and to estimate the accumulative rain (sprinkler) uptake at the time of surface ponding.
The theory was tested and firmly supported by the results of a multipurpose laboratory experiment conducted on samples of a Nibley silty clay loam soil packed into columns to a density of 1.25 gm/cm3.
Checksum
e8fba44e3929a5d12ed426467ba27df9
Recommended Citation
El-Shafei, Yehia Z., "A Study of Flooded and Rain Infiltration Relations With Surface Ponding" (1970). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 1564.
https://digitalcommons.usu.edu/etd/1564
Included in
Copyright for this work is retained by the student. If you have any questions regarding the inclusion of this work in the Digital Commons, please email us at .